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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea3e43189f7ffb9c12ebef22d64c6f2e043652606c1e58e12fb577968c034e7' 
  AND token = 'lMbnWlSXAw2TFDIv4/zJxGj6fhktALBXmRgh7JSI46s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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