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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f1d0d3ad542fc90c01b35714cee9e367e492d72f1bcdb2c3b5943b2eaa74c1' 
  AND token = '8vTdS9/68BQrEqRO5pqUgv5ttavm9qJeY6vo47p9u+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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