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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe4e98722b1a9e250a6c0c449055579027225bafc349e766e51577e6a8ec6e1' 
  AND token = 'hkcbsLQRHf+LzAJUS4JaJorqDGRWLN8kfJ5okIAipYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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