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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dcd1f3b828c81ccc94afa807a7891acf7646d799a92711fee83efb8ff2a3da' 
  AND token = '4EvaMPgajVH7dTNetCCx+Pkr1OSOVGaPg44RIeXbHzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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