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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebeac52fbe2c3641f47d6caa71d7b786b5e23b73a5f7e09152b4f270df89ef4' 
  AND token = 'R7yzFawppotihf0CwS9nfr0UOIivkrikQKv+K07u2nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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