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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a94d7029dde3c64cb6037f5ddd15c2f6e0b982c7dfc6f839c22b8ab68060aa' 
  AND token = 'waw6uZgYfWcs5ij/6UVb5n39hCO9FE4IUzE8awm3pBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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