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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf14dafa010940068b96bbe5e016dda3ccc7094c7b26c69ea3702f048e798aa' 
  AND token = 'JRsDASkY/OCNs6lQw7zhQcaxKxvHp7N6aqj7Hzx8a2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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