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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28b96e2de16bf6414b77e01fc17c8c4358fc9d9f3117b71c54878fa1e7f7a1e' 
  AND token = '1393KVKWp4AvuclwXxmP/KN6lyDbpHADH504fv2Y9tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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