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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f364866570737fc30f23831533b7fc6a2ff1ee2c543632b33e2edb2a47fa87e6' 
  AND token = 'jTgfr04o6pshLPSf8ab11ukDcjwpfDuNLCfUXZUcSYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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