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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1b357836178dd2ef71217266e4a459fbbcf435f3a5dbae5d1f38aafc046cff' 
  AND token = 'dlkz5zHqPs3SWUpFD9Ziq0OqoKFDk+0eEN4DWXlimnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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