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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc83db5fcee3fe8cc3b6e44d4818b511fc8f7a84cabcf100181f40b223f66e7a' 
  AND token = '2rpSophepOetSaXvd9WuEMnyx/dnX8L1YV/L6hy0w+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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