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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac48eaa5eec79619b29604f2a622ac53bfda11b686d3bd9d38b5c0ad7631b5fe' 
  AND token = 'J8hlA4s0Em8hcD3Iq5EW9RlYciOoR+o5Y4h9bpOv5+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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