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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7f66433cf4e86eb02b9adec782a8f827977862c8dcac5b9ff35ff32f6788ac' 
  AND token = 'xPvNppMUWldnrdO6eHztyS+6BxiaIYY6byPVK+09lIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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