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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fb7d926485782ce7ff9d2fd0cd08c9d18adee0cf8b86176ea7003579bd05ec' 
  AND token = 'UlH06CTvEtZ9HRixlCOaGMhCSn848FE0U09S2atA40E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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