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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e408a197a040c717192ff3907546ae5a4edc76bcd4093596a66162826d90a68' 
  AND token = '6dkfaVmupCShoVflC2T+GkUB3Ex/gwPyFeTsylQ29hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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