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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a76a1da53f6d966000348ba7db106025d994b23e5fb0233f47b8a68f45dad59' 
  AND token = 'J35U7SI7YlXvifjoJvg3N9uFgTBM5hPhO7DTfEixLtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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