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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf76508a759557a56549c48d3ece102fab8e372c81f56574cb93e189d2c0a859' 
  AND token = 'C72RfYuuWlqG1qAnjQE7o/9f5QlVbc8hR3jea7TA6gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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