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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb34f5cce7414472b2481c23e99ce21cfcc52233b02ccfe9ac051e1abc6ca389' 
  AND token = 'LcHqufX+AWCM3IxSg7r1rfuKK1yuatGcQ7jB8g9U7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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