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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e77981d5462cfea2dca58d1009e2b613362a4af861925a296467f2bd1a4d4b' 
  AND token = 'ma6pJXOph9mb13vsO7BxkcOhWEaeca5YeIY+ZEPo2r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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