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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95294ed0032bedd90d57e7a9372efdc5d06f24cd37e8ba31f929870abbaa5d2' 
  AND token = 'nUyPK1QveCgcEI2Cc1Vb0XwFjYWhxhTLyi+BUjmjBDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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