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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3961b8061ac9c3a32994f66e527eae12e983e917cd7c483f42bca0596081b343' 
  AND token = 'P3Uns8IFeCtEGaYlI4TF7HV8OwnEfrOYx/gMIuZsQwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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