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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f708ef12a5e1cf6033a24362445f2b3d6ff182b5167ac8d59c45b380efc9d7e' 
  AND token = 'BgtIRMCH6dDCAVPBuZFs9ciTXePq2gyISWZdniXycKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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