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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64133f84cd87e25b548e24e48a25bb2a3af661a5e0312df6e0da5d2388a30295' 
  AND token = 'jPEYH20QwH0XpB2awJBy+0vqKFhYgyDl85wqawlwtpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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