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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b38dec11e1548ebf6568050845774b2b17e54d64c8c2a80739735bb65798595' 
  AND token = 'pd8LWsUnHvIR8RfeTkcsed7LMau4P4zwhV8JEQB+T3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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