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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b5b9684ee803321cf14b05569234694fefaac86b5c3ae7dee3e4bafbcc1793' 
  AND token = 'jEC7EK8C9tpoT8nHHYaki4mwPfmNNf82K5o4NWL1G1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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