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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fa781e0701ccd29bfc622743e6b47ae8571b65a723ae880a7c476cc5af7709' 
  AND token = '6tELGxXeV38OT/9ch0yO4LNYBGWmWFzZ79tcvE1ZCf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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