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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28b2405df1623916dabe55a819dd00cf74f8736626013c20d0921aec810f5a5' 
  AND token = '/PVRq0F7NvTqdlgxF1TlMuVWRo4n8SmncNi5Nu+iVO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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