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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7416da74c525b62726f2f777a822804c02b9655fc74e8ea73db171226ca7baa' 
  AND token = 'CGWhxt3pEeGr0tRGAtmz1NWdumKRNavIBS8zb4i2a44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}