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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d235d174167b34dd0f621655a4afa42bdb4ec379bc130d6a625e132c1a7399' 
  AND token = '8EKqgg8FVCu68akK3k3HADfU6S5HK6wXG6gjNgxV5pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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