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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ef88a29d5e0deb7aaaf54d9ccc13510648f1c83af39b9b40b532a47db34bf9' 
  AND token = 'zbXuEPtigSB53kFhrU0xS5gEJGOiWvEJoxScrLu0+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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