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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619b8dbd9cbf01a9c1b7d1e9410bd220cf84c1750d60d2f45f4e27002bc03d52' 
  AND token = '8hEWdqFqjPV4JfEguOMn2+xks4AAro6vxRcLQw/e7F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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