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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15616d768ae1e133dced42e450143ef2766b9fbaf6d419910d4c7bc2807b36d0' 
  AND token = 'CAnxT6SNkdT1YD/gXqjIxTsiIZnIJsgAlavBslyHmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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