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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f79aecec1afb6f8bb20bd8be6907c70f73c16411899b39437762902ce0d5fa' 
  AND token = 'm5X6VwUtyxGdPE8HdIdP8GqFT8aWEREK8vHvqZhtspM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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