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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f1fa739e03fb039957e3d923c83350602471df4b69dc33c1b42da990516d9b' 
  AND token = '0aqrOBteVTlcu9Y0ihXqZ37dct0m3/FXTyKact+jCPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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