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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a5158d5850911c0d82e2724cc9c9e14bd0fd208eb67b6904bc7c8d21550745' 
  AND token = 'yvohLKSX21SONGqHZOjhlpCS7xnOjoJefVQN7nxTQWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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