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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c833473bdd6aa11e454b6c244c6afcdc17d7ff814a0a73365aa1b9596ee3967a' 
  AND token = 'BgzJrAC0dWZsDc1jZv7oCvxhkayXk4jh+HEDW0qGFiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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