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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a70dabddf23a28db04c90964c06b8e0064f1f6d5ad3c5974a0bf92dbfbbd7a' 
  AND token = 'nX+mTV5X0a3wZTecZyzFKo+wq8Q3GG+Jc6qZTnln9QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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