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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1066caadf10a31b5a8140c6850535d35741878c3592fbc73e85f83a80c07c50' 
  AND token = 'oIkhvN1zF1VBt7179u5QAfQpILPCJRPju4HVhNgt5f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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