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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687ca0c35f08ffacd95d19cd68a9521436906399c2bf0e87a6c85dc3890fab58' 
  AND token = 'uAnRQeM2EWPyvR6CpHHbTmiKxBmFz47VtKP6YfAXYlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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