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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98897c4d2d983c1fb5b9c975f18193cffabb1ea833f7a78a39b39a15973d64ed' 
  AND token = '0K9l14ikeFLbf8HbBvwMFx1nmpYe/NxrffTkMDKJDaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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