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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babb1b349d9b9d3cc3eb21aaf2737844b213aa22151614b8857a034d8fcab4c8' 
  AND token = 'WjHxSXXbc/tg2V4DZQFO34id3A4Na7OSBtNckdJtAIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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