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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a119cfa19108e9f0d5f05a3de84b7a964c01dd94d0dad73a8bb8da9d355835' 
  AND token = 'HYao6JR5kxJcDgn33JmnSKRqNP5GAkOa3EFWd8Hq6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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