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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34403cf6ce5db2dbb55c9e3844dd4ba82bb66c7974070a90dd9522d0bc730d5' 
  AND token = '5Sba9rEfisgBYW83mbDpk23ShGYTJLOKRsNsvZc8D8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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