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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71799cf6de56918d24b55eb1691aba432caec6159c7bdd0d642dc8a8b0e87bed' 
  AND token = 'aqxrVRU2LKUvO2KsnQv4U7Xq84vuZvRBESaANsZb8YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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