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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df759725850887a9c16c99277751e37fe9e9bd8b8135ef6c25e03ae3dcbfc63' 
  AND token = 'oUsD4ecU46NOb8DjsWnPlcpxz/Sx38J6QhFKpYfNAhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00507

JSON explain

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