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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9eaae8b9a04b7e32772ae9b4cfbf06fb24ccfa2aceba34e10d61c7c9982865f' 
  AND token = '0PhBXisxsOF5Fpadj6nVV1/0GRrEaD/Owx6kwzJ2C4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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