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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55de012fcb6791c0a35f8eeb9015fd0a2f18f592cb913d3a3d8bf87aab32a5ba' 
  AND token = 'I3T6q+Gnb5ciodcPD9HUKexKj5rfVYuECCxHG5cSShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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