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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a866040bfee543d430a075676558e4c2f878e70c0f40c8718cd7f2e03e5d89' 
  AND token = 'MhwkQ+AISSzqCqiIaDBntGXX6TilWyWej5kHNwG/dMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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