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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffd77bea354eb93ef9a4c77b102b11c05d31177953d45e84b519877c805fb5f' 
  AND token = 'QlZ3kWh3gWaTHHjmM9hlQxTYDbIK2uOfqMCOwfEgxHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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