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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5535716102537a83e6a866482e70ab1bdbdf608721da9ab2239dfdee792bc26' 
  AND token = 'KAMt6ctgC6nAd31dbu2BYMZuASnQ694Zn+JTCSBgVcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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