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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5cf98d32ba80038c36c727e3dd22f674a7cc7e00156c422f9e7f4bbcfbe3a5' 
  AND token = '5hInOh309VWfKaec4Tn7DIS94w1eH6Ts9d0FcOmMGqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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