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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940056b9a41160063688f6bddc0edc3bff27565190c79ef83b88dbf488290f57' 
  AND token = '9Ufec07CpH+Gh8u19mDlhj0ihEFZ1TNBM/RuxF2D8TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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