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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de850c182201eed9ed0511fb9e95bd33f722e77fb76a1ffc542140c7f05372ee' 
  AND token = 'BCizchd9rbMtOp5WMv4w0z9ZJWwEuiM4KeZig0bumzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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