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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd46bcf660285f8f7230cc758608eba5a8e693f8ee9f909a96383bfd1f83255d' 
  AND token = 'SgCsG3jtS37QamgdcBsWdRr6Jgim1Gh4+/2G0FEC0BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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