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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc5b802987908d8099706c8f8b186c7ecef45ebe6ab20251da1d37882ad9ffd' 
  AND token = 'ww/FYao7lTkX0tv56UarKL76OmhVHqM/aFft9Q8j6Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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