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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505d005680d0915d69fcebf5dd50f28182cd9da58a9ef5320db7fb69fadec4f9' 
  AND token = 'vritBMhihCPWtTF8Mr6me4HQE4+/UMlkdL/ByGyC5EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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