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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748f65a3d36936d22a35198edaecb1395118cbe0ff11c2e23c2ceb83decb8da5' 
  AND token = '5lKeddtvaQ38DwOn/eBCQ1jxq7cq5LDo0ZLjHuoy+XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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