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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f5bd99b2921deb913db7ece33ba9c2917e96ac26e72881863362281f85b50' 
  AND token = '5Xy7Cna1c2JwpzHD7/GNrN5np04xan5yJzEGpK/NwF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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