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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa73033b6b41ac23be2c0c0c6fd28246f6d720961e5309fabf474aef3a8582de' 
  AND token = '0aSss6+D0IfvXxZ16UnxOGxwpALW7r32ptPBYjeCmvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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