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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ee671b6ebf717416a57b390d308ff8541cedc0d3b3b103190fa7099bfc415d' 
  AND token = 'wz9lkyyp96O8icfehuMseZRG9/zhG73w5irHFxpsgfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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