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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635563ad8d22805042d67b887457ef8f96e6923d7df43e5b2218d49b3ac14d59' 
  AND token = 'Okf262S28phCrkb5BQ/8U2rUzqUFupsTaCHSQmErtrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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