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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558bae171b91573ada728ade1aa4708ac73a3d1f60c751f6f5bb9603c993e7be' 
  AND token = 'SvKbKbZLFHfLuuuxjQjH+wBNeaN1vQwZMw6WGe+ZnuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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