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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050e917aa9a80ecce17a6b48fea409fb272b11e052d2fbc17f3dfd1f63ff428b' 
  AND token = 'c9qzMIWMKMNJZTLS9GtDe6dhWpWszy1muWmt+icSQkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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