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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20bd1f06c67e6f6c86f7e1857d8e93c07192f2cc32876edf5395449252e4a8e' 
  AND token = 'MOIimj3yHF4ExgsEaLW1afLsQmYU6gguB1KgQidBCyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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