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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb7e166ab71952e8968d19159fd1bf52f91782e61c24ec9e5db76ff83eb3767' 
  AND token = 'HqvF3T+mgblwXf9nA7sp7zocuae8ioenBBxcPNzjre8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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