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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6be27865275bcd7a3ea8454bafb0346816d5b5b7b68ede3a13994194f810a47' 
  AND token = 'QKO87GT0jS9fZfS1ZT3wEpGXJ6TnDi61MiEdvMBecfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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